Marine Biology

, Volume 161, Issue 3, pp 711–724 | Cite as

The influence of symbiont type on photosynthetic carbon flux in a model cnidarian–dinoflagellate symbiosis

  • Dorota E. Starzak
  • Rosanne G. Quinnell
  • Matthew R. Nitschke
  • Simon K. Davy
Original Paper


We measured the relationship between symbiont diversity, nutritional potential, and symbiotic success in the cnidarian–dinoflagellate symbiosis, by infecting aposymbiotic (i.e. symbiont-free) specimens of the model sea anemone Aiptasia sp. with a range of Symbiodinium types. Four cultured heterologous Symbiodinium types (i.e. originally isolated from other host species) were used, plus both cultured and freshly isolated homologous zooxanthellae (i.e. from Aiptasia sp.). Rates of photosynthesis, respiration, and symbiont growth were measured during symbiosis establishment and used to estimate the contribution of the zooxanthellae to the animal’s respiratory carbon demands (CZAR). Anemones containing Symbiodinium B1 (both homologous and heterologous) tended to attain higher CZAR values and hence benefit most from their symbiotic partners. This was despite Symbiodinium B1 not achieving the highest cell densities, though it did grow more quickly during the earliest stages of the infection process. Rather, the heterologous Symbiodinium types A1.4, E2, and F5.1 attained the highest densities, with populations of E2 and F5.1 also exhibiting the highest photosynthetic rates. This apparent success was countered, however, by very high rates of symbiosis respiration that ultimately resulted in lower CZAR values. This study highlights the impact of symbiont type on the functionality and autotrophic potential of the symbiosis. Most interestingly, it suggests that certain heterologous symbionts may behave opportunistically, proliferating rapidly but in a manner that is energetically costly to the host. Such negative host–symbiont interactions may contribute to the host–symbiont specificity seen in cnidarian–dinoflagellate symbioses and potentially limit the potential for partner switching as an adaptive mechanism.

Supplementary material

227_2013_2372_MOESM1_ESM.docx (34 kb)
Supplementary material 1 (DOCX 34 kb)


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© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Dorota E. Starzak
    • 1
    • 4
  • Rosanne G. Quinnell
    • 2
  • Matthew R. Nitschke
    • 1
    • 3
  • Simon K. Davy
    • 1
  1. 1.School of Biological SciencesVictoria University of WellingtonWellingtonNew Zealand
  2. 2.School of Biological SciencesThe University of SydneySydneyAustralia
  3. 3.School of Biological SciencesThe University of QueenslandBrisbaneAustralia
  4. 4.School of Health SciencesUniversity of KwaZulu-NatalDurbanSouth Africa

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